Description · from the CVE record
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_inner: Fix IPv6 inner_thoff desync
In nft_inner_parse_l2l3(), when processing inner IPv6 packets,
ipv6_find_hdr() correctly computes the transport header offset
traversing all extension headers, but the result is immediately
overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only
accounts for the IPv6 base header. This creates a desync between
inner_thoff (wrong — points to extension header start) and l4proto
(correct — e.g., IPPROTO_TCP), enabling transport header forgery
and potential firewall bypass. This issue affects stable versions
from Linux 6.2.
For comparison, the normal (non-inner) IPv6 path correctly
preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite
ensures that ipv6_find_hdr()'s calculated transport header offset is
preserved, thereby fixing the desynchronization.
Affected
ProductAffectedFixed inSource
Linux3a07327d10a09379315c844c63f27941f5081e0a – < c161ad9157f5a0429b5ff94d9770faf3bf48d273c161ad9157f5a0429b5ff94d9770faf3bf48d273CNA
Linux3a07327d10a09379315c844c63f27941f5081e0a – < 870d59e2cf218e7418491e26bad768cb16654582870d59e2cf218e7418491e26bad768cb16654582CNA
Linux3a07327d10a09379315c844c63f27941f5081e0a – < 689bbf48c1f45130086ae1c46ab83ea4c753c601689bbf48c1f45130086ae1c46ab83ea4c753c601CNA
Linux3a07327d10a09379315c844c63f27941f5081e0a – < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ced0f98a3617f6ae5b1e95cde1e68e7ead4a1279ceCNA
Linux3a07327d10a09379315c844c63f27941f5081e0a – < b6a91f68ebfed9c38e0e9150f58a9b85da07181cb6a91f68ebfed9c38e0e9150f58a9b85da07181cCNA
Linux6.26.6.142CNA
Red Hat Enterprise Linux 10see advisory0:6.12.0-211.30.1.el10_2redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:6.12.0-55.84.1.el10_0redhat-SADP
Red Hat Enterprise Linux 9see advisory0:5.14.0-687.22.1.el9_8redhat-SADP
Red Hat Enterprise Linux 9see advisory–redhat-SADP
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutionssee advisory0:5.14.0-427.135.1.el9_4redhat-SADP
by Kastro